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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fde26e9e6cd7dc4c4e5c687c30e5f80e8f1a3e019c0a2baca61debcfbedb319' 
  AND token = 'rjC+6JkgFkKlXGArf7S7Qwpsp9Je1686NcXTbxLNB+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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