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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c891d536a794a4e26d73a8f8084df46135eb9a4d4d91b4c41aafcc5f9c1231a0' 
  AND token = 'HsUhoj1bGE8g/g8pB28a6N41dIQf8IbTavtcmpoMGQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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