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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b376b66cffaf674d8c6563a0b6ea828498df1195a662207553c3dca47c628e4' 
  AND token = 'XF+XcaNtc7DNBlwYUBDZKPPy7c0yA0pg9zEW/beSxLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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