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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18004d4ccc2927fb9d0e93e76fe7c9e478e20c30bd1912891cb3e73c9c17f928' 
  AND token = '/74SecFGg6nvTpZTS9oSMlL3+EHgxX0lW+1cLy64O6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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