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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94127fc2bd15d2683dea1811c864be7e87662b195dae859488933389c4ee9d6' 
  AND token = 'ot3Bj9uqoq9pKAjDX0y5cQmrFZp4/dkOl13BA9fmnZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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