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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d11ebd8b20a3500387988567f89f9aa9b2a27ad68e760e31cf8f3a2f028ef3' 
  AND token = 'lbT/ga9gU22UoEIC1uqIZ+o/QKhJmiOIuge48ibTFfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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