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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b62963823b6d5655e2d2121364d764678e18a623b79a2cee2f07c11d217c9b' 
  AND token = 'dldH9h5WF6cj4x5aDSEiS875kCkr+YvcuSCBX0iZZOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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