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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f311c8f3cec49721b324d4164a9e5f561dab043bae77ba05c67bdd1c257e47' 
  AND token = 'bx04wbxfb7/BHXEyAKQy17wptkjeoSaJGQx+XIDsfYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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