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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c82d2fcc7c98c0518070d9acaae3e2893dd368f0c62ddd104f26333e6dec71b' 
  AND token = 'Xby0N73njfbIbiW6mNTqaO2jI+7KdnHA/M056hjj+UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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