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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a9a60c110b181884690bb051227da05c9798e360d81951a08c57017f9d2911' 
  AND token = 'McqjLRFtpELPpwsFij4+CHbMx4NDti/ECq1tSf9gYqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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