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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1515d4d59875e523ff283ae1b5fbefea58fd4de4c5a8a8d91c8ed5835edef83' 
  AND token = 'p/hYCJXg37alL/3Hkbkz5GXWsJqzYysX3uXTKGIfBHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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