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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8a5d4cd0c7059ad4682b5a8e341d174126142ff4b3c1a1cc2fbfc8e349f8fa' 
  AND token = '7/FeV14jxdu/+Q6fiO+dSOsnIDLor/QtfW+WyT1dAwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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