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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fed6956eee1ab97e4c355556e788ea661024968bfa849c66622b69dc3884fb' 
  AND token = 'MFij6cSoGw3fug+Ztnsp03m1bdjc5ANsAgC/sAJ8KQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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