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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0893d65669814b0c17ad0c194d5c36f72fccb7f9f48a5cc3ec7f2690dd83ae6' 
  AND token = 'axw2xz26gA1agCw0T8YscB3THgWY2vLg4lKeNcIlODU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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