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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cfe471ed33cc1de7465c21fb71077856291e79c8ed9c77c9989467f56de854' 
  AND token = 'q1LpBeE1TPj3zNBcarxtSvethfUE5GqxU6X3eef+uM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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