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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b22b2c42271659728a42727567ba32dfa72482c44921c0f5c2fd9f90a17d6c' 
  AND token = '3s/WLxF/MqhEfA4M5i4ESs1A1BfnfBzeuB2gVo6girw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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