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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67480377f1156cb61c6c7e1db482160efbd3f60452a33204ac6f26662dcdb8b1' 
  AND token = 'ag4fpFp5TCT5La6DiyNadQKPZ0ehJcI4qZilG+GK63U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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