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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e786fd782d132b3c7ddc3d6a2627d01014329a7e41b30072dd740f4989908ef7' 
  AND token = 'wPpDKu77PmzgQOW4kdNo8g3BrkyGvr2RD8cAgB6yG2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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