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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d92c9e3ffbc7b6667365e3581d46470e72a9d668623579138e3153b52e914e' 
  AND token = 'X8M896mawmeillO3ptgRJZ66LNAf3LJqHuTniWjtecY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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