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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2f294b154629939aca24b929de49b8a5a3fae5a6be626337aa2e71f62263a2' 
  AND token = 'ySdcV9TtJawqMLLq8fSNw6ZgEvzecRvsctfYZsE7XXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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