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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9178fbc5d6d80bc78ec09c9c000c1991df9661857ebe6adac260db93ea8f5e23' 
  AND token = 'Y0cCq7CUjzBh6ZuVQQbP8+pAq0fHJ7MrjQQepUKwhjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}