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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436a7402a656e5095d5753b5cd5ebdbf5c1f5608fd2d3af876644b1366527318' 
  AND token = '8HU/83bhEC+BghI1WYNQycHkj/rjQi7BVjyME5wIEeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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