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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d2d827377b048902ff51533344aa477786448a6ded0c9330cdb8055db31a5a' 
  AND token = 'R6vac54jcitpaag0oGYgZ/n+LH2JyEyy5qsMF9xVXOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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