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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da1054ce3fadcd59d4cd6e0e7f344271b6e315e29626ba933ae4bc4195bf4bf' 
  AND token = 'I1c9nkJwUaOCasChUWoeq0iKWMaTUyDPh/vm6ozXgSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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