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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72325c42e6c36d4df71aa772a52677633dcf63e698bd80a5d6e197797e8c7f91' 
  AND token = 'N3/O998bOM0iGwa8+cGsqgEgW0iiS7c+PwOQfKSiz5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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