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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cda91c9481471bd1963dcd9b6da2eb9496d0a9d304b5d2a88546ef71bf85ea' 
  AND token = 'eJxgGO6CBH/DXF1ZfmZFlw32qroLfGE8fBZ7+fscrfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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