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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3af429b39d7c59c89a3a3235cdd11f8c8b8fe109d6a36bbb0f4cc4e846c5fe' 
  AND token = 'Icw/8hfPUPhRvw1sac4ect5Ovm+FUIpTAuuAE/SrytA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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