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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee768e3a8b6c5e096ded7727f52550b825af36fd5ef4000bae5c67ab543f7f9' 
  AND token = '3cuh1OcHenIqQHqr2BTRNPqsuQAOBhA2Mdkk8s6o1wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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