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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030e2be25c802c07f88b69ac5b08d6091ca201f46f404b4c8ac846b93565f56f' 
  AND token = 'dkLbMapzWusiJAlxjVD3f1H8aTRFx+FFZQS9UjQecbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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