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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0039575a5456fee87be922abbcde45e9e2cfa8c404281588aa2fc81ba537215c' 
  AND token = 'R56JlddLsdD9xOqbNgB9avl/9YtevF0yAMgpa3Xl9hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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