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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2424c3b2ebb3cab337fbe90b07944fcf53fcecf25b0ec3b4f4ae9d296fe41c' 
  AND token = 'QL0tnqmgoPuOLo3NxHFiSkzPimAszuy70C+ZjSUl1DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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