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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a209d757d97093ccad382f7edab48cddaf504a9b1a986e7cf0c091ecd8ad45b4' 
  AND token = 'cV4/5EhmUngK9A8E4nlqLzKKYiHvXfOa4GUfG1gG12Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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