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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7beb285d1433b586886f02fef820a6da0234e05f6ffa1a20d83d6c9a0565dfe7' 
  AND token = '1xd0szdqT9OVz1Qh8l4ibKSfDXsq3o9drOVG6mctdD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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