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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9783776f5f81678a69ab7962a2768445a6550a285f92a5496937bfaa1ae028ab' 
  AND token = 'huiyvP62NcIKUeHxjyjmyvmxhBqEs2Cp6khPekzmJNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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