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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d90a9fae7986742a1078388b5a3432679c45c9d94266aed54e95424e0233013' 
  AND token = 'OYrvg41xFpmx+2l3EjK8W2I6OKItabfaD/M2QO34gkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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