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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9c3f8e6f69be56503644b24a9ce1fb383efb382732e9246d6bfd7b791a8efb' 
  AND token = 'lJT9R/tyt+3ljshvnUqcIZm2EdW84Lx1Vn1ds2lzH+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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