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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f52e73830d46ace5f8f715ee349b2dbb34ea92516221ba776d6e76552da8fb' 
  AND token = 'xy93b+iA5qH85x/zmXhSKKIX9vDywiVU7Z2nRn6F5OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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