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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc69aa62cbf638dcd4147946364e2e6c4291915df8801107868cb426a9c85d1' 
  AND token = 'Tha/8QgrjpRcAmO9D0oDxoo/ZhN/zUkOSR8e/5Rwnqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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