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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd0a19725573536ca24f7a17d0da49203b4b664e2273cc053010069669d601e' 
  AND token = '0b2cz6TdppnLdWSrfV4omA1uVkaUHEX/z0yZJbMmzzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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