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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d10ff95addefc7fed382eac0512b11b677c7536eefcee12dcb39a7d98091f06' 
  AND token = 'OjKQeHSlAi006B7zr7cJqEjwFHkoGfIDrcLVNEcZjCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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