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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6566d46493d569424e2feb9c701bdef674cd5a2ec6575ab9fe43cfaea79dad04' 
  AND token = '7bzMgOlnEFsTS39LLZyIalHvd95SYH3SlYE9zs7LcOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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