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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e0d17ca9f41e51742627d1d9a88470b0f44d6ad1fabe308e2411982cfd2658' 
  AND token = '3OE2ZrPt1/onJBkavOvyUkX4NeA+/i+6SCpvDWE6YJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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