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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ca03ef7352dc869013da73e28a71630be0e8f902d8cb6fc0ff7cc172e9e79d' 
  AND token = 'Ovktsoyp5fbkn+0/XBtFVhtu3LImG+ntuXUY7HhG4l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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