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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e46dad4d0d60f162f2fc35cdf64443b6b15cdb073b6095fc67f6f339f844dd' 
  AND token = 'BhQEYJlrdbIZwA0k9F5Qfc73Qhb3MFI+bz+PIDgUToE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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