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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c0e4e24ede4ac882f534fa8807067a223a2e5ff9cc37ffc91e988249f0a5f1' 
  AND token = '6bvlwPw8WUHQEAyNCoe1lWA/HP3oJJ8BnCb6GDP9U/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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