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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9856a9f034faef4bdeb6d35ce20f2117f3657f9af2677ce479edd36ee53c0a8d' 
  AND token = '0cyFtOmwALKN/4Pi2wJom1932Psr+IjrugNmyRGwOSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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