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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fb46258c50e9c5ace4a657baf9d7354fb248ec075f5c78f70947ab0d00a54b' 
  AND token = 'q9wmLCK0hg3/gw5eweCHZHSffMC7paLCrfGzb2RKdRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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