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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a223ee870893fe6ab97e75ebfb1feaf78b69b6f7b30408269a9b1f67d2b761d0' 
  AND token = 'Dg5sbW0K+i+DP+9j7faNhF7eUs07qQPrF+B2fwWeGyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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