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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83697605c83b0ab5bed8acecf7b8a07dbd3ad9aff1b2f6c4914af02bbf14a748' 
  AND token = 'LL0Eu8XEbsyt2Qyc5nclBs5sNpCnpK5Ig5PijL8b9NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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