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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46363affef25fafd454a7d9ef849ae6e6029e7c047dd6cd6086d760364dbcdac' 
  AND token = 'GlOoRGoRh9qyufD9/3hrjHCEM9tW7pJCE6ovCe1zvGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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