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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3924eeacf1f56acbf9538e44efb64aad4cc9a7604240f118b7d1d7c6a3c6a7c5' 
  AND token = 'vHMrdsDdZsvUO3KHmTZDJ2jhLQOZQhH4i5YyketKTjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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