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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247ef402f84fcbed7690d7bdb872c30f251ac91c1ac4d3b855ea6514844affab' 
  AND token = 'sjSTMPbMda7m590cw54zlow+H3+K77KAXfQ4KZ2RJaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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