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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894c79526cadea356e4f4276771640fdbe6d05fc7aa55d7ffa46086862bf5003' 
  AND token = 'T6f8w7svbcoo3yiV2VD7R57Qq/QgcL2MR28Qe5T06lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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