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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cd52baea1f867c575a6a0c0387944096d2b24daedaea4898c842c1edf96ea5' 
  AND token = 'QR3GarW0ZRWnsp8/k9TGVpk00C3BkVfR9dV89oA5Q8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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