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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c596829efcd0e42cb97935b59605c2c3c2d6c843525792dc5c62bf9889ed96b2' 
  AND token = 'jazks9Aqy+q3YzT8zX1OC56VC7jj0HSWzB2q9byC4qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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