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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac7fb69a701bbb5da0dc3f0417e348627ba6ef5142ee67ce05c4a6d60f0d6a4' 
  AND token = 'afyiEgw83e+jJWesfMGoXIX9aBlczqvM1Hs67QWfqOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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