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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ad695b7a48c318228da146ee98a2d7b303f9531e7429a6eebd05843ead1d32' 
  AND token = 'AIZH39bBVNSw4ofy2DBRPoBFI2z8s/gvAG4a0A5DuNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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