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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22fafb31401da59df23e10f094036a4c41ae7355aa809124647c99ed3cd14d6c' 
  AND token = 'OBKRuy0YCRBZw4s/2i0LMPH7L1ErlFo1qz6c1BMzhno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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