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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e42d795d4a53b8d6898b2631eeaea8e0302339924210db8d2940218793b4a6' 
  AND token = 'sTvOBvjznW6C7yx0HOn3GjOlsgOD82cdoiD24Nm9eVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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